Central heating only working when releasing water?

[Sampayne21]

Hi,
The Boiler is a vortex combi 21 oil fed
The central heating will only work manually if you drain water from the system
(I’ve been using a valve near the front door with a hose to outside) while simultaneously filling from the boiler.
Interestingly it will stay working once it’s manually been pumped until it’s turned off and sealed.
Hot water to taps etc is perfectly fine

So far have tried:
Changing both central heating pump and water pump for good measure,
Draining the system and filling again,
Checking for any air locks and bleeding,
Repacked the programmer and thermostat,
Serviced the boiler.

Any other ideas anyone?

 

[Darren Jackson]

What you have tried has obviously not worked, so the next step is to call in the pro's. Unless you are a pro & in that case we can offer you more advice in the non public section once you have being verified as a professional.

 

[Aire]

Getting the system to work by draining and refilling is irrelevant. You've changed the pump but is it actually working? Follow these steps in the fault finding which should give you a better understanding of what to look for.